帮助的示例文件，更改用户窗口，admin 这个用户在 管理组，不允许改其他组

确定  按钮的代码

Dim UserName As String = e.Form.Controls("UserName").Value
Dim UserGroup As String  = e.Form.Controls("UserGroup").Value
Dim PassWord As String = e.Form.Controls("PassWord").Value
Dim OldUserName As String
Dim Parts() As String = e.Form.Text.Split("-"c)
OldUserName =  Parts(Parts.Length -1)
If UserName = "" OrElse UserGroup = "" Then
    Messagebox.show("请输入用户名和用户分组!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
Dim dr As DataRow = _UserTable.SQLFind("[Name]= \'" & OldUserName & "\'")
If dr IsNot Nothing Then
    dr("Name") = UserName
    dr("Group") = UserGroup
    dr("Password") = PassWord
    dr.Save()
    If Forms("用户管理").Opened Then
        With Forms("用户管理").Controls("ListBox1")
            .Items(.SelectedIndex) = UserName
        End With
    End If
    e.Form.Close
Else
    Messagebox.show("更改用户失败!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If

请问应该怎么改